Brush the potatoes under running water. Make in a saucepan covered with salted water for 25 minutes, drain. Quickly rinse, peel and cool. Cut into slices. Cut bacon into cubes. Remove the skin from the onion and cut into cubes in the same way. Grease an ovenproof dish. Put half of the potatoes in it. Mix bacon and onion, put on top. Put the rest of the potatoes on top. Mix flour with 3 tablespoons of sour cream until smooth. Add the rest of the sour cream with the egg and stir. Add salt. Pour over the potatoes. Sprinkle with breadcrumbs and grated cheese. Put butter in flakes on top. Put in the heated oven on the middle shelf.
Baking time: 40 min
Electric oven: 220 °C
Remove from the stove and bring to the table in the form.